SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4be028056ed10b943c45057f2d8cdeb6af5780f936478b40313b8aef62854c' 
  AND token = 'ACHkFDw/hish5c1Rj1NkEZKU7R7gN/hLGcOZSTGDVpQ=' 
  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"
    }
  }
}