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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c423078270a2b8c8f1718dd670e54a33d3d3806136738da366d9562a12a13991' 
  AND token = 'Qq2CxyK7nvlx8O9NNyc3yjF2r71ZXDUCoVEe955+caQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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