Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea78d1e159ed8571ecdc944f972c4a8da8af26b3ec4928028cdef72ece9ff83' 
  AND token = 'F9EcVcR6+mTW9CIgYalgu00CiGiR1foq79bzpKNNTUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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