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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82574bc9cf3b65db886fb174e41fbc097d5025d5e26122dc7a90ec31ce547f7' 
  AND token = 'pd8dHxrwI2xn7YSqVR2xCuDDzErqcHK6UG/NhUz0I8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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