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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344468501908a56d03015ea3841eb397c8026f2e2972d8aece607ad7f9d4b68f' 
  AND token = 'GHUh2N7PchMYZMbtUdIj3F1I0YIQZWAp4ImVWTo+iWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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