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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f8cf8c58f7d752872a54f72bfd1ca806c489eabc4f50d10fb45ed21adccea4' 
  AND token = '152thvwEKKRtKRfzFwsHkU5tJ/pKfR2uI0zI9SE3Bek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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