Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f4726feecbfc47a24a1e690e663535c96bd93e17b04e7bd6236a208dbf1af7' 
  AND token = '8KsCQU6mzmAPBVAKPlEGCaMbS7BXdVeuO5nXNWZpKWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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