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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bdcc83be09751f17b8955f306b5ce8b661dae81273867198d000f41f6f5e4c' 
  AND token = '2wWkqpVegv09mA018FChz/o4Fh/HSNqAe3nJD4qJrFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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