SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da07c0d448f2d7cfa3dafefb4f30c45f09f3c970e00052f15c2d709574b8cda' 
  AND token = 'ZW0bPrSmYF1zvLShlC6O4Ba1wzgnn/+PuNph5MQqxrU=' 
  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"
    }
  }
}