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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d538a2138b1ec1b65ec7ce9e8cb8db98e40a744ffe2f92e8646f52ddf7d8e7' 
  AND token = 'kcr4Nn6Julis82PJ5iOxksLW6mu+42sOHwOCp3/iGhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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