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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47ea11dfb6eb21ee43cafc4413d54eb281d1adc501f2773c233e078e3c85aa4' 
  AND token = '7v+g/EaneDCtxLKlJpnUC+xlvMNjyEXeVK72VM637Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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