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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df14c668d0f1f0b1df830cce85f3566043407d5969b85f40d393fbed8a8ed47' 
  AND token = 'MyDsYjT0W+afY90ysJ52UJl1im5iA4XkTpV6KbNN3tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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