SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadcc780aacf06576563b98ad15ea03b6de0f3b285398f39f865b1dd2719189b' 
  AND token = 'NtYzaGmOXD6cj4HpMVpksHG/xMFXy7pmsvo4mUgwI5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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