SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3604d7feec94c1e277041662f859813c4aef917dbed890309343d6383a389c40' 
  AND token = 'MSJ1qKggivnBWZgvbONXrVvQOiwAx3yYQJR/7z8O/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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