SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1167be5a967212ba6ba59ea3d04d31245fd22b06c3a2a764156ca6c5c41c3138' 
  AND token = 'snPX+h/C3ljC86guXBE1NSRA9SkiCqpokZ6D8BKVFVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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