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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb61006ef8c3d28bc6ca0d9d03ea81ec8dbd29dadba69578d76c46e62854e06' 
  AND token = 'ARsI4N6Ol/cAGgQlt6z34STghI83WyOBU6juVku7C4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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