Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efa6ec1f1f0414942469eb8b108e6e007db994d09392f25b042c9958dcd3f85' 
  AND token = '3NnQb83sz5uNnR3VEwk60BZI2OrAgHuiMYdVyxGxqS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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