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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45173ef200c33178d6f3947f94a0234e0048b85e10f991aee04c1610b533757' 
  AND token = 'GBgf88yqr0nawuGHuWvKCWWaWkiYx1aq3ktqhjJi7Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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