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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850cfbc3b0056ef49c825836a9e68f333f51df02b8692b9a5b9c18eed80e3f27' 
  AND token = 'kbjNB1HEsqibfSzvJ7ObtK/0vqOhaoIzr1hDf4yfzdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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