Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29da1cae96dfb734e1771a0f9d6388585530867b0981ba646e46ae55d7f5d25' 
  AND token = '5R/jKHuYjw1zM6xhzKTR5RBk0eP+f4FbFjcIvzQAd3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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