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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8511d09c1caad6a9547462d917928ba553bd4736238088005cf70da2e7f78f06' 
  AND token = 'N7yPw4Ty8InYMO9F/Wnmp6fJP+qHqEZLTWUafB9uLt4=' 
  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"
    }
  }
}