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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13d3fbff9b1a53e9d6e70d5db1f29db01e2facb8597e15b9169f34c3dd7ee4a' 
  AND token = '2p7DrgCUSWCa/6eNJanH3y0Xp+SZl5U14FyTmsBYe+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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