Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4534a61fe27fb0471eb480316e3b3cd918f2e4fa3688e0d76b3bf1104e607e' 
  AND token = '4q4kss+5Ci4klbiWInCiKUqjBr4ewepUlCa0s6g3LtI=' 
  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"
    }
  }
}