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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aada5ab421ae0540b0ecbd85e113d1b5dd875df9663b33df39a0dfea70cbd3f7' 
  AND token = '9EnLUz6v19Ke2RQa6dhbRH+HlYyaTre1IYAPuW8dcmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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