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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d62121e28b43238e5384791de3c013fab21fde65380406c287ca73278fcfec' 
  AND token = 'ItgEGgetXNYzKMLZTIeqH+JIdi/+hH6o+w1hIOg4bNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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