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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc90399e723677f4ec3c29119dcf529da3e94331440094e1c9a7f71e9cfed06c' 
  AND token = 'yYr1esMIJgt+zwe4RrxT/0BFhnbayam7ZpEMQHMF5Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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