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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0aef8b44f7ebeac46e50ea6e31533ce85ca34e9148170884c639e9bb6906ad' 
  AND token = 'wkOb/gTzsBr8jBziR+Bte8iole97Pgagvc7tCieinj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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