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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769cace85a9a70a2dfa166050a0d244c56dcd3a5e4c402cf6d8c92a4bb0cf6b7' 
  AND token = 'kKoNk+Gtkd966X4GdgKu+f3Pb2ZoVXoUeXiB/D3bsgw=' 
  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"
    }
  }
}