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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a69918539a0879ab3ea2f4e94dc6ae7208f2734774673a1afe4d0a7a79b262' 
  AND token = 'qiRl+Ev+7t+Dgs3pIRyDm/9w45Uf6xmMgx3G0qSA3vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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