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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e155ab48329fc59e5f94046203ba2fea5bd3bda86460a7a2f4f5260ca89ce3a' 
  AND token = '8pYVaOylHDEqa4FAklNqsJBh6vCBvB/yqFwZLI2MD9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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