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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce8882989552486d8c16f96ec232b33c260f60c3c42e9608fd997963f827669' 
  AND token = 'NCcAJUMyWq4gFn/i5XZnSZ8MRFgnfKloaQZ+hR0FcLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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