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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b4595a869c279df2f4309199d9d4a0cb47626638a7a1d489d8d2a1d9aa4d2c' 
  AND token = '3hTEnb/MEjbaIUqJKuE2AI9GbhS26AfXkJMltAeXlyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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