SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75541b8c45b6eaa0a6153f57a44157b4d7113787406ccf51592a194b0c82b37f' 
  AND token = 'mSfzwalDREuOSpBUgJq/ir1ppWYijs89wrKouhQH61k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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