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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c370e97d14fc8585b3b096f629702135f1acedf56e86cd522cb0a53dbf102a35' 
  AND token = 'rS7F88wV/MLcF1GFD781i4UU4v1qAd769RJTZx3cwZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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