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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b58e9c3d364af2128111951f3faee2cbe7ed8330d58a2bfea051fb174c5949' 
  AND token = '24RFdaTUIiUKRSMZHOBwRNXzeHr26xcR68aNbrS5FpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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