Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12a2292b031b73cfef846eea07fd022071cbdd98ef4eb99ebac944548af9752' 
  AND token = 'u//HaVzWbu9sOk5KWxjowigLXL8HOo+HhQQKSoCRV00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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