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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d456e068f809d96b141e35c468364238f63ad64f393bfc054fa8a09cf1a8b14' 
  AND token = 'wryluNcatqEH+Q3nlsTibMt8+UOHdPzXhK3OjRl+pr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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