Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692ca7600da0459f6d4cf9ebb48299c8c970c572010723f933fb6eccd76f7029' 
  AND token = 'iZ0Z0O+F9nJ6ECSw2Ts9SF4RXpulLzjNdasJ7zGq3/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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