SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5633a8647358796da4f4b17d3ea77e37821a63db7f8ed04f8709a557c281202a' 
  AND token = 'GohQpwjiSTYDHJZUaVzd1kMmrgjRX4+oW0pEdDbbD+s=' 
  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"
    }
  }
}