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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a6a9b3afecbc99fd191d60b325cd5dc105c7beafe1d9a9ef162ac091b36aff' 
  AND token = 'ajl/jdBZllNEzn858sKUHH3+UlcFM0YiDwJYuN4RlHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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