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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c35c75a9643c7240669375f18841a8c8607d90b0a7a29a107720eb53dd54ea' 
  AND token = '688GmQaTnkwdiyPpT/2KxRkHYW/UaHfTgIzl2IWOz9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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