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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874d8f57380cfb904e966629ac52cb37f53b53eb536e49d11863e386275e1367' 
  AND token = 'DJdyZ4Ydze53dvYCDwj37Dkm45Jy/as5nlnZtwgc2As=' 
  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"
    }
  }
}