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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c10dacae421fe9538ea6c7cc9a28e74092d8b9e9589fcdf15a037b22ee6afb' 
  AND token = 'QMn6P1ghlU5APa+EJOtRiHaba6FuT5oOiOTvIEAGY6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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