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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce01b8c7d55fe05604f985c02d442bc7aebecb56b86eb01f7c53c8ed765d6d6d' 
  AND token = 'FxHDJGPgG7wBFOyXosXWxaGPYjnbN9X4BV9lVB10FUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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