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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c631121404865f55a8c541a7df8da1e0fcde97ce76173f8b09982f336482f8' 
  AND token = 'NL5A7GdRYCvJY0P0q8Jys318v6sH0yq6+VXY6Ic3QIg=' 
  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"
    }
  }
}