SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99483579aa558d667a9cbf4fe39f9861c65ec2dba97546ab1ab234fec7ed2072' 
  AND token = 'KI9FIhSJIqHvtUKoAIiYv3Ww7i4T/b67HO/gPV7KFdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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