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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d085e0962e79061ddcb141aee9105831beb3f545f3e79e3fa5899fa43e9627' 
  AND token = 'jQq6F+X9gPapcrBE24JRFrw24+vmD+9EuYoGjUxV0r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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