Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75da2a4f7aacda2afdc6ded57b4edc96e1bf02b96da7b69f5de7b0ccf5857524' 
  AND token = 't3wN9SYJx9xpCtAuOiHRl8T/pUJ2ebRP1FU+3Z2jErs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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