Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e9396ebfc89c164ab4a09df53ad78a0004ddf1e7ba72c0b3a808948d4ffa0c' 
  AND token = 'Bl7UVCdSaOOJboBcYaWfZ281/+TCRbXutunryMJUEek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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