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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9313c378d38623cd9e6263c70d2f6238c06c06eec346313c6f7bffe4a1e01b4a' 
  AND token = 'XmJRLv+f3D3BCzZdblLoWTrtMLooH0FDHhE1S1TKCdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}