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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c213b08ba00b454b628fc8eb197bdc524f277a72b08cd6644ab0c99eafe5af' 
  AND token = 'DZP4EFLZbn7s8Ur2BmpybiniSVQfJrPnQGll8j5ltFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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