Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ff4a24983f3ea0e00a595840094b299240fdb4b25247b5c1a4a771a3cbe2aa' 
  AND token = '+vMFnzZuPa8WkAdEUJ1HZGPS3DmEIXrjdMonBwdghc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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