Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2460a406f2ebab5c1206837c989e3ebca146218a9e9f0215b4ccb7bec0aa1c3f' 
  AND token = 'qbuy9AVDcW+I8Yi80cVgrAxPV6Nq9ANrDk4S0cZRDZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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