SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d680d7404b3a103104205ecfcbbd806c12a07e5729795d6f172dc5b670864e' 
  AND token = 'U5YqXGkDXJngu2rCTgpI75az7vNYNJ7Izlw/ZmgVV7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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