Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461dcba00d04ca029c3392d83cf494968c5b182d0a6e64f50a05ca3d7d77a489' 
  AND token = 'BTfYryoI78AEvsDTCnJ2IddEPpJ3NmNaHWrj2mJHOQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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