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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4674bd2bf1cb8895de1fb78afd477537f2a5b666a513f12c6a6e6fcc0c871ea2' 
  AND token = 'zDhd8ZemSx5Hn1YSXO3SScUWQuxPonhuWYjkPqLPb84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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