Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d3b19ec69ec2bb0070b7ceb61bbd37010bd44cdb23d2f51e7ae82571d0d0e1' 
  AND token = 'yGvoNQnipfvs8nbb0a4FBGi1pTR+dPkisbz9V/5mIMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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