SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d22ea19a12948e5b13de832b7674098d33a7b2d19af32bb4fcf1e79e35b107' 
  AND token = 'AmPrq14Rd99SKVKBATXvvDjwRIKWWcFOh5JsK+Y/M68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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