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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44da0623a06ab896e912f4e202a17a130c2938f93f4590d9e68bd888e734e30' 
  AND token = 'MjA9aECfxNhKq5g0/lMk79MlwnPE8rGK5Vcxl0dcUMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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