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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd19991466225ffd3565b764ff7bdac49e232b9f2246a19a3fea72274a81a35d' 
  AND token = 'gGdzaZ6iYCH01PwupFklCdcnZNsJUut6+TeJNaJbM/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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