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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb9d36e67345bffd7de5d499bbde2afbd5038291f467444e2f9f6f88871ed35' 
  AND token = '7FG+DQKytWhPa0dg87fpPlHym2lch+AAWAbvLzAfE9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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