SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289446f3c64a4fcbb42011893bd374849e5529a85ecf94901df937768478f165' 
  AND token = 'E3l0lB+K7xtEIQYjZ68gGdNfu4KN0Y+VnDAzK8tsjvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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