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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c79e33acde580f57ebd7367885a2d8504edfb363069239a280edd3ddcdd358' 
  AND token = 't4Dbt0CUigxpZR1EkqBiwZdVPIAt4IYI7fsuvMsP7iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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