Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6710411f621e7c18adb2c51c515d0f7b14f0f433b5511767fe737b93e5ad0135' 
  AND token = 'ODaTWxvboDxMkMWg9DLjmFXH1jmYynmikmnlxR3Ai3g=' 
  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"
    }
  }
}