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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6d06b06169e6620cb624c86485c2b6791f1d9e3baea308685164bc24c55695' 
  AND token = '4+eMtkcRiJss7oLAz2hDNlHSaO23/xtj3pvwugfiDhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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