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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daad5a5b3f36162d75a7a560e0ba17b571318961f10d262f3dc6e21c0bb19839' 
  AND token = 'rtiE0AQDbX0ZuGGEuTQmhFdrBGW3f4BC8wZLcTzHpx8=' 
  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"
    }
  }
}