Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b938d5de26e6d797866b39df032fd8982930ad969334826414537093ff72e19e' 
  AND token = '2cvIRW0ySOI3jFn7FJvLua8q4FsJUOg/72UY/J3700s=' 
  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"
    }
  }
}